单箱三室混凝土箱梁爆炸毁伤模型试验及数值模拟分析  

Experimental and numerical analysis of single-box three-chamber concrete box girder under explosive loading

作　　者：何志群 周广盼[1] 丁建国[1] 张国凯 周瑭 HE Zhiqun;ZHOU Guangpan;DING Jianguo;ZHANG Guokai;ZHOU Tang(Nanjing University of Science and Technology,Nanjing 210094,China;Shandong Jiakan Engineering Survey Co.,Ltd.,Jiaxiang 272000,China)

机构地区：[1]南京理工大学,江苏南京210094 [2]山东嘉勘工程勘察有限公司,山东嘉祥272000

出　　处：《防护工程》2024年第1期8-16,共9页Protective Engineering

基　　金：江苏省自然科学基金资助项目(BK20200494);江苏省自然科学基金资助项目(BK20220141);中国博士后科学基金资助项目(2021M701725);江苏省博士后科研资助计划(2021K522C);中央高校基本科研业务费专项资金资助项目(30919011246);国家自然科学基金资助项目(52278504)

摘　　要：为了研究近场爆炸作用下单箱三室混凝土箱梁的破坏行为,采用10 kg TNT药柱,开展了节段箱梁1∶3缩比试件爆炸试验,观测了箱梁试件的毁伤形态和动力响应。利用ALE方法和LBE方法进行了试件爆炸响应数值模拟及验证。参数化分析了不同比例爆距、起爆位置、配筋率对箱梁破坏形态的影响。结果表明:10 kg TNT炸药在中间箱室正上方0.55 m处爆炸,中间箱室顶板形成贯穿性破洞,破洞沿横、纵桥向长度分别为81.90和98.50 cm。随着TNT当量增大,顶板破洞面积逐渐增大。同等药量工况下,中间箱室顶板中心正上方起爆时各箱室底板开裂程度最为严重;与箱室上方起爆工况相比,内爆作用下箱梁顶板破洞沿横、纵桥向长度分别增大了28.2%和41.8%,且底板形成贯穿性破洞。随着配筋率的提高,箱梁竖向位移明显减小。In order to investigate the damage behavior of a single-box three-chamber concrete box girder under nearfield explosive effects,a 10 kg TNT charge was used to conduct explosion tests on a segmental box girder at a 1∶3 scale.The damage Pattern and dynamic response of the girder were observed,ALE(arbitrary Lagrangian-Eulerian)and LBE(lattice Boltzmann equation)methods were employed for numerical simulation and validation of the explosive response of the test specimen.A parametric analysis was conducted to explore the influence of different scaled distance of burst,initiation positions,and reinforcement ratios on the damage pattern of the box girder.The results indicate that when a 10 kg TNT explosive detonates 0.55 m above the center of the middle chamber,a perforating hole is formed on the roof of the middle chamber,with dimensions of 81.90 cm and 98.50 cm along the transverse and longitudinal directions,respectively.As the TNT equivalent increases,the area of the roof hole gradually increases.Under equivalent explosive conditions,initiating the explosion directly above the center of the middle chamber results in the most severe cracking of the bottom plates of all chambers.Compared to explosive initiation above the chambers,explosive initiation inside the girder increases the dimensions of the roof hole by 28.2%and 41.8%along the transverse and longitudinal directions,respectively,and a perforating hole is formed in the bottom plate.Increasing the reinforcement ratio significantly reduces the vertical displacement of the box girder.

关 键 词：破坏行为 模型试验 混凝土箱梁 数值模拟 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]